It's after the resignation of Edouard Philippe who has been in the post for three years.
Mr Castex, 55, is relatively unknown in France, although he is a senior civil servant.
The new Prime Minister has been a key player in the government's response to the Covid-19 pandemic.
US skips congressional review to approve arms sale to Israel
The US State Department said on Friday it has approved a sale worth $151.8 million to Israel for munitions and munitions support, without submitting it for congressional review.
Partial resumption of air navigation in Qatar
Qatar’s Civil Aviation Authority has announced the partial resumption of air navigation, using designated contingency routes with limited capacity.
Kuwait and Qatar thwart fresh wave of Iranian attacks
Kuwait and Qatar reported intercepting multiple Iranian attacks.
After a week of war, Trump demands Iran's 'unconditional surrender'
US President Donald Trump demanded Iran's 'unconditional surrender' on Friday, a dramatic escalation of his demands a week into the war he launched alongside Israel, which could make it more difficult to negotiate a swift end to it.
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